Mega Code Archive
How to create read from a structured storage file Part 2
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Title: How to create / read from a structured storage file Part 2
Question: How to read data from a structured storage file
Answer:
Article discontinued Due To Abuse.
// Part 2
// Author Cjpsoftware.. Not for commercial use...
// contact C J Pringle support@cjpsoftware.com
// Part 2 on how to read / write from a structured
// storage file..
// Copy / paste this unit into a new application
// add 1 edit box and two buttons
// When you are ready.
// Click on Write data 1000 the number will be wrote to the
// storage file
// click read data the sturctured file will br openned and
// the stream read. The value will be displayed in the edit box.
// I have provided the unit you can download
unit testunit;
interface
uses
Windows, Messages, SysUtils,activex,axctrls, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls,comobj;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
FRootStorage: IStorage;
stm: IStream;
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
// Write data fromn ss file
//
procedure TForm1.Button1Click(Sender: TObject);
var
strfile: PWideChar;
Myvalue: Integer;
BytesWritten: Longint;
begin
// Structured Storeage File
Strfile := 'Sh.ss';
// ===
if not SUCCEEDED(StgOpenStorage(Strfile, nil,
STGM_READWRITE or STGM_SHARE_EXCLUSIVE,
nil, 0, FRootStorage)) then
Begin
StgCreateDocFile(strfile,
STGM_CREATE or STGM_READWRITE or STGM_SHARE_EXCLUSIVE,
0, FRootStorage);
FRootStorage.CreateStream('Index',
STGM_CREATE or STGM_READWRITE or STGM_SHARE_EXCLUSIVE, 0, 0, stm);
End;
Myvalue := 1000;
// Write Datat To Stream
Olecheck(Stm.Write(@MyValue,sizeof(Integer),@BytesWritten));
end;
// read Data from ss file
//
procedure TForm1.Button2Click(Sender: TObject);
Var Myvalue: Integer;
Bytesread: Longint;
begin
// Open Storage File
If SUCCEEDED(StgOpenStorage('sh.ss', nil,
STGM_READWRITE or STGM_SHARE_EXCLUSIVE,
nil, 0, FRootStorage)) Then
Begin
// Open the stream within the ss file
OleCheck(FRootstorage.OpenStream('Index',Nil,STGM_READWRITE or STGM_SHARE_EXCLUSIVE,0,Stm));
Stm.read(@MyValue,Sizeof(integer),@Bytesread);
Edit1.text := Inttostr(MyValue);
End;
end;
end.
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